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Practical Reflash Tuning: Introduction

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00:00 - In this worked example, we're going to be applying the HPA 6 step reflashing process to this 2009 Holden Commodore SSV which is fitted with a GM L98 6 litre V8.
00:11 For all intents and purposes, that L98 engine could be considered to be the same as the GM 6 litre LS2.
00:19 There's some subtle differences around the cylinder head design between the L98 and the LS2 but for our purposes really it's going to make no difference to the tuning process.
00:28 The engine itself is already fitted with an over the radiator cold air intake from VCM Suite as well as a full exhaust system.
00:36 The interesting aspect that we'll be dealing with and focusing on for this worked example however is the fact that it has been fitted with a large aggressive cam profile from Kelford Cams here in New Zealand.
00:48 This cam provides a lot more lift, a lot more duration and of course along with this comes a lot more overlap.
00:54 This is great because it does provide a significant increase in our high RPM power.
01:00 We should be expecting on our Mainline dyno somewhere in the vicinity of about 450 wheel horsepower.
01:05 However this does come with a few considerations around the way we go about tuning the engine.
01:10 In particular we will be using a 2 bar speed density patch for our tuning.
01:15 So this does away with our mass airflow sensor and we will be tuning on the speed density operating principle.
01:21 The reason we're doing this is that the large cam profile creates a lot of reversion particularly at idle and this can play havoc with a mass airflow sensor.
01:32 On top of this, to make matters worse with our OTR system or over the radiator intake, that mass airflow sensor essentially sits right on the throttle body so it really does become a combination that doesn't work well with larger profile cams.
01:45 We'll also be addressing some of the more common failing points or issues that we see both from novice and experienced tuners when it comes to tuning the GM LS series of engine when fitted with a large cam.
01:57 In particular a lot of this comes down to the idle speed control and it's common with cam upgrades that won't idle well, stall when they come up to a stop or won't idle when they're cold so we're going to show you the steps that you need to go through in order to address these issues so that they're not a problem for your tuning.
02:16 Now that we know what we're going to be dealing with, let's get into our tuning process.

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